Bilioenteric anastomosis reverses hyperkinetic circulation in bile duct-ligated cirrhotic rats

Abstract

Background/aims: The chronic bile duct-ligated rat is used to study hemodynamic changes in cirrhosis but suffers from total biliary obstruction and deep jaundice. The extent of reversibility of hemodynamics and histology following bile flow reconnection is controversial. We aimed to characterize the hemodynamics and histology of bile duct-ligated cirrhotic rats in which bile flow was reconnected by a Roux-en-y choledochojejunostomy.

Methods: Operations created four groups: double sham (control), bile duct ligated, and two reconnected groups. Cardiac index and regional blood flows were measured by radioactive microspheres 4 weeks following the last operation in the first three groups and 8 weeks afterwards in the second reconnected group. Liver histology was assessed by a computer-aided scoring program.

Results: Cardiac index, mean arterial pressure, and systemic vascular resistance in the reconnected groups were different from bile duct-ligated rats and returned to control values. Portal pressures in the reconnected groups (4-weeks, 10.0 +/- 0.5 and 8-week, 9.7 +/- 0.6 mmHg) were significantly lower than in bile-duct-ligated rats (13.7 +/- 0.6) but remained elevated compared to controls (7.0 +/- 0.3). Portal pressure in the reconnected rats was correlated with cardiac index and mesenteric blood flow, r = 0.66 and r = 0.45, respectively. Liver histology was improved in the reconnected rats, with decreased bile duct proliferation, fibrosis and apoptosis.

Conclusions: We conclude that many of the histological features of secondary biliary cirrhosis are reversible after bilioenteric anastomosis. Furthermore, the hyperdynamic circulation is also largely reversible and is related to the degree of portal hypertension.